Crush the garlic with salt in a pestle & mortar or with the side of your kitchen knife into a paste.
Combine with the egg yolk
Whisk in 2 tablespoons of the olive oil and beat until the liquid emusifies and thickens.
Beat in a further 2 spoons of oil and repeat. You can now pour in a thin stream of oil as you whisk to ensure the mixture doesn't separate. The mix should be thick like mayonnaise, because that's what Alioli is!
Stir in the wine vinegar and you're done!
Serving suggestions:
If I need to tell you how to eat mayonnaise, you really shouldn't be on this website. Or doing anything else for that matter. But if you DO yearn for some suggestions, then try spreading it on a slice of Spanish potato tortilla or adding a dollop to a paella. You'll be glad you did.